Victron Energy Argodiode Battery Isolator 100-3AC. Three batteries, 100A
Victron Energy Diode Battery Isolator Argo 1003AC. Three batteries, 100A
Diode battery isolators allow simultaneous charging of two or more batteries from one alternator, without connecting the batteries together. Discharging the accessory battery for example will not result in also discharging the starter battery. Low voltage drop due to the use of high efficiency Schottky diodes.
Datasheet: Argodiode Battery Isolators